Hair roller



FIG. 1 is a perspective view of the hair roller;

FIG. 2 is an enlarged view of area 2 in FIG. 1;

FIG. 3 is a side view of the hair roller, showing the banded appearance of the webbing from which the projections extend; and,

FIG. 4 is an end view of the hair roller. 

The ornamental design for a hair roller, as shown and described. 